Universal self-locking locknut device

Abstract

The utility model relates to the technical field of nut fasteners, in particular to a universal self-locking locknut device, which comprises a bearing nut, a convex nut and a concave nut, the convex nut is arranged above the bearing nut, a point-line contact device is arranged at the joint of the bearing nut and the convex nut, the concave nut is arranged above the convex nut, and the convex nut is arranged above the concave nut. And a self-locking device is arranged at the joint part of the concave nut and the convex nut. The point-line contact device arranged at the joint part of the bearing nut and the convex nut and the self-locking device arranged at the joint part of the concave nut and the convex nut are two independent units. The bearing nut has the functions of conducting and bearing transverse vibration force, and the concave nut and the convex nut have the function of preventing the bearing nut from spinning and retreating after being mutually locked. And the point-line contact device and the self-locking device are combined together for use, so that the problem of nut looseness is perfectly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of nut fasteners, in particular to a universal self-locking anti-loosening nut device. Background Art

[0002] The eccentric nut uses an eccentric tapered surface to achieve a shockproof effect similar to a wedge wedged into a thread. The eccentric nut has been widely used in the high-speed rail industry. It is easy to disassemble and repair and can be used multiple times. When the upper and lower nuts are locked, the parallel offset eccentric angle will allow the lower nut to transfer the vibration force from the eccentric contact surface to the upper nut in one direction. Therefore, the full contact surface of the general nut will not cause the vibration to be evenly transmitted and cause the nut to loosen. However, the eccentric tapered surface of the eccentric nut is prone to additional lateral force applied to the thread during assembly, affecting the use effect or life of the thread. In addition, because the eccentric nut is generally subjected to lateral pressure, the screw rod is subjected to additional lateral force, which will cause the risk of breakage of the screw rod due to the lateral force. Therefore, from a safety perspective, if the nut does not loosen but the screw rod breaks, there is also a great safety hazard.

[0003] At present, most of the new anti-loosening methods on the market have the following disadvantages: most of the anti-loosening products that can withstand large clamping forces cannot meet the anti-loosening needs of small clamping forces. However, those that can meet the anti-loosening needs of small clamping forces are not ideal in the anti-loosening effect under large clamping force working environment.

[0004] The Chinese patent "Anti-seismic Nut Kit" with application number 201810875313X, the Chinese patent "Arc Centering Anti-loosening Nut" with application number 2020222451733, and the Chinese patent "End Taper Centering Interlocking Anti-loosening Nut Kit" with application number 201921638777.5 can all achieve effective anti-loosening effects in many application scenarios. However, in actual application environments, the above patents have high requirements for bolts, and the installation conditions of bolt clamping force above level 6.8 must be met to achieve a more ideal anti-loosening effect. At the same time, there are a large number of installation application scenarios that cannot meet the more stringent installation requirements of anti-loosening nuts, resulting in inability to apply. For example: when installing power towers, especially at high altitudes, it is completely impossible to install them in a standardized manner. At the same time, there are also a large number of bolts below level 6.8 in use. For example: a large number of mechanical equipment, transportation vehicles, etc. have aluminum alloys, copper alloys and other products that need to be installed inside, which cannot withstand the clamping force of the original design patents at all. For example, a large number of field construction operations cannot conveniently use high-precision torque wrenches for a long time, resulting in irregular installation.

[0005] Therefore, it is urgent to design a universal self-locking anti-loosening nut device. Utility Model Content

[0006] The utility model aims to provide a universal self-locking anti-loosening nut device.

[0007] A universal self-locking anti-loosening nut device comprises a load-bearing nut, a convex nut and a concave nut, wherein the convex nut is arranged above the load-bearing nut, a point-line contact device is arranged at the joint of the load-bearing nut and the convex nut, the concave nut is arranged above the convex nut, and a self-locking device is arranged at the joint of the concave nut and the convex nut.

[0008] Furthermore, the bearing nut includes a bearing nut body, the convex nut includes a convex nut body, the point-line contact device includes a tapered chamfered platform and a perfect circular step hole, the top and bottom of the bearing nut body are provided with a centering platform, the tapered chamfered platform is arranged on the outside of the centering platform, the perfect circular step hole is opened at the bottom center of the convex nut body, the diameter of the perfect circular step hole is larger than the diameter of the centering platform, and the angle between the perfect circular step hole and the convex nut body is in contact with the tapered chamfered platform.

[0009] Furthermore, the concave nut includes a concave nut body, and the point-line contact device includes a concave circular groove and a convex cone. A concave circular groove is provided at the bottom center of the concave nut body, and an inner convex circular chamfer is provided at the angle between the concave circular groove and the concave nut body. A convex cone is provided at the top center of the convex nut body, and an outer convex chamfer is provided on the convex cone, and the inner convex circular chamfer is in contact with the outer convex chamfer.

[0010] In summary, the utility model has the following beneficial effects:

[0011] The point-line contact device provided at the joint of the load-bearing nut and the convex nut and the self-locking device provided at the joint of the concave nut and the convex nut of the utility model are two independent units. The load-bearing nut is responsible for the transmission and bearing of the lateral vibration force, and the concave nut and the convex nut are responsible for preventing the load-bearing nut from spinning back after being locked with each other. The point-line contact device and the self-locking device are used together to perfectly solve the problem of nut loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0013] Figure 1 It is a structural schematic diagram of a universal self-locking anti-loosening nut device of the utility model;

[0014] Figure 2 It is a cross-sectional view of the load-bearing nut of the utility model;

[0015] Figure 3 It is a cross-sectional view of the convex nut of the utility model;

[0016] Figure 4 It is a cross-sectional view of the concave nut of the utility model;

[0017] Figure 5 It is a structural schematic diagram of the utility model in use state.

[0018] In the figure: 1-bearing nut, 11-bearing nut body, 12-taper chamfered platform, 13-centering platform, 2-convex nut, 21-convex nut body, 22-convex round platform, 23-outer convex arc chamfered, 24-perfect circular step hole, 3-concave nut, 31-concave nut body, 32-concave circular groove, 33-inner convex arc chamfered, 4-bolt rod, 5-fastener. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The following is combined with Figure 1-5 The utility model is further described as follows:

[0021] A universal self-locking anti-loosening nut device comprises a load-bearing nut 1, a convex nut 2 and a concave nut 3, wherein the convex nut 2 is arranged above the load-bearing nut 1, and a point-line contact device is arranged at the joint of the load-bearing nut 1 and the convex nut 2, the load-bearing nut 1 comprises a load-bearing nut body 11, the convex nut 2 comprises a convex nut body 21, the point-line contact device comprises a tapered chamfering platform 12 and a perfect circular step hole 24, a centering platform 13 is arranged at the top and bottom of the load-bearing nut body 11, the tapered chamfering platform 12 is arranged on the outside of the centering platform 13, the perfect circular step hole 24 is opened at the bottom center of the convex nut body 21, the diameter of the perfect circular step hole 24 is larger than the diameter of the centering platform 13, and the angle between the perfect circular step hole 24 and the convex nut body 21 is in contact with the tapered chamfering platform 12.

[0022] In this embodiment, the bearing nut body 11 is a common hexagonal nut, which is rotatably sleeved on the outside of the bolt rod 4 and threadedly connected thereto. The bearing nut body 11 plays a role of tightening and bears most of the bearing force and vibration force.

[0023] The top and bottom of the bearing nut body 11 are both provided with centering platforms 13 that fit with the fastener 5 , and the tapered chamfering platform 12 arranged outside the centering platform 13 is coaxially arranged with the bolt rod 4 .

[0024] After the fastener 5 is installed on the bolt rod 4, the bearing nut body 11 is put on the bolt rod 4 and cooperates with the bolt rod 4 to press the fastener 5. Then the convex nut body 21 is put on the bolt rod 4 and rotated downward in cooperation with the bolt rod 4 until the angle between the perfect circular step hole 24 and the convex nut body 21 contacts and fits with the tapered chamfered platform 12.

[0025] The load-bearing nut 1 and the convex nut 2 are only in a contacting and fitting relationship, and no locking force of rotational friction occurs between the two.

[0026] Preferably, when there is a slight unevenness in the contact surface between the fastener 5 and the centering platform 13, the angle between the circular step hole 24 and the convex nut body 21 forms a certain amount of universal adjustment effect after contacting the tapered chamfering platform 12, so that the convex nut 2 will not be twisted to be coaxial with the bolt rod 4.

[0027] The female nut 3 is arranged above the male nut 2, and a self-locking device is provided at the joint of the female nut 3 and the male nut 2. The female nut 3 includes a female nut body 31, and the point-line contact device includes a female circular groove 32 and a convex truncated cone 22. A female circular groove 32 is provided at the bottom center of the female nut body 31, and an inner convex circular chamfer 33 is provided at the angle between the female circular groove 32 and the female nut body 31. A convex truncated cone 22 is provided at the top center of the convex nut body 21, and an outer convex chamfer 23 is provided on the convex truncated cone 22. The inner convex circular chamfer 33 is in contact with the outer convex chamfer 23.

[0028] In this embodiment, preferably, the convex chamfer 23 is a circular chamfer or an inclined chamfer.

[0029] The female nut body 31 is mounted on the bolt rod 4 , and the female nut body 31 is rotated downward in cooperation with the bolt rod 4 until the inner convex arc chamfer 33 contacts the outer convex chamfer 23 , and the female nut body 31 is tightened.

[0030] The angular contact between the inner convex arc chamfer 33 and the outer convex chamfer 23 minimizes the friction between the two and maximizes the torque transmission, converting the torque into the clamping force between the convex nut 2 and the concave nut 3 as much as possible, so that the two can resist the friction of the back-spinning of the bearing nut 1 after being firmly locked to each other. At the same time, the angular contact between the inner convex arc chamfer 33 and the outer convex chamfer 23 forms a certain amount of universal adjustment effect, so that the concave nut 3 will not be twisted to be coaxial with the bolt rod 4.

[0031] Since the bottom of the convex nut 2 is designed with a perfect circular step hole 24, and both sides of the bearing nut 1 are designed with a tapered chamfered platform 12 that contacts and cooperates with it, there is only a contact and fit relationship between the two, and there is no mutual locking force generated by tightening. Therefore, there is not enough area between the two to form a huge friction force to effectively transmit the self-spinning retreat force of the bearing nut 1. The self-spinning retreat of the bearing nut 1 cannot be effectively transmitted by the convex nut 2, and its vibration force is interrupted, and the loosening problem is solved.

[0032] The point-line contact device provided at the joint of the load-bearing nut 1 and the convex nut 2 and the self-locking device provided at the joint of the concave nut 3 and the convex nut 2 of the utility model are two independent units. The load-bearing nut 1 is responsible for the transmission and bearing of the lateral vibration force, and the concave nut 3 and the convex nut 2 are responsible for preventing the load-bearing nut 1 from spinning back after being locked with each other. The point-line contact device and the self-locking device are used together to perfectly solve the problem of nut loosening.

[0033] In summary, the present invention is not limited to the above specific embodiments. Those skilled in the art may make several changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the claims of the present invention.

[0034] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0035] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

Claims

1. A universal self-locking anti-loosening nut device, characterized in that: The invention comprises a bearing nut (1), a convex nut (2) and a concave nut (3), wherein the convex nut (2) is arranged above the bearing nut (1), a point-line contact device is arranged at the joint between the bearing nut (1) and the convex nut (2), the concave nut (3) is arranged above the convex nut (2), and a self-locking device is arranged at the joint between the concave nut (3) and the convex nut (2).

2. A universal self-locking anti-loosening nut device as claimed in claim 1, characterized in that: The bearing nut (1) comprises a bearing nut body (11), the convex nut (2) comprises a convex nut body (21), the point-line contact device comprises a tapered chamfered platform (12) and a perfect circular step hole (24), the top and bottom of the bearing nut body (11) are both provided with a centering platform (13), the tapered chamfered platform (12) is arranged on the outside of the centering platform (13), the perfect circular step hole (24) is opened at the bottom center of the convex nut body (21), the diameter of the perfect circular step hole (24) is larger than the diameter of the centering platform (13), and the angle between the perfect circular step hole (24) and the convex nut body (21) is in contact with the tapered chamfered platform (12).

3. A universal self-locking anti-loosening nut device as claimed in claim 2, characterized in that: The female nut (3) comprises a female nut body (31), and the point-line contact device comprises a female circular groove (32) and a convex truncated cone (22). The female nut body (31) is provided with a female circular groove (32) at the bottom center, and an inner convex circular chamfer (33) is provided at the angle between the female circular groove (32) and the female nut body (31). The female nut body (21) is provided with a convex truncated cone (22) at the top center, and an outer convex chamfer (23) is provided on the convex truncated cone (22), and the inner convex circular chamfer (33) is in contact with and fits with the outer convex chamfer (23).

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